Question

Which one has more formula unit: 1 g of NaCl or 1 g of KCl?

Answer 1

KCl has more formula uni mass.

K is 19 and Cl is 17

Total mass is 19+17=36amu

Answer 2

NaCl has more formula units that is $1.030\times 10^{22}$

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$     ......(1)

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of formula units

• For NaCl:

Given mass of NaCl = 1 g

Molar mass of NaCl = 58.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of NaCl}=\frac{1g}{58.5g/mol}=0.0171mol$

Number of formula units of NaCl = $(0.0171\times 6.022\times 10^{23})=1.030\times 10^{22}$

• For KCl:

Given mass of KCl = 1 g

Molar mass of KCl = 74.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of KCl}=\frac{1g}{74.5g/mol}=0.0134mol$

Number of formula units of KCl = $(0.0134\times 6.022\times 10^{23})=8.07\times 10^{21}$

Learn more about formula units:

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